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Company Restructuring (Tables)
 9 Months Ended
Sep. 30, 2015
Restructuring and Related Activities [Abstract]  
Schedule of changes in the restructuring liability
The following table presents changes in the restructuring liability during the nine months ended September 30, 2015.
($ in millions)
Employee
costs
 
Exit
costs
 
Total
liability
Balance as of December 31, 2014
$
3

 
$
1

 
$
4

Expense incurred
16

 
2

 
18

Adjustments to liability
(2
)
 
—

 
(2
)
Payments applied against liability
(11
)
 
—

 
(11
)
Balance as of September 30, 2015
$
6

 
$
3

 
$
9